Copy letter from an unknown correspondent, to Mr Collings, 172 Strand 'Please let me have estimate for enclosed six figures [George James] Burch & [Victor Herbert] Veley (Phil. Trans. ['Philosophical Transactions of the Royal Society']). Fig [figure] 1 zines. Fig 2. Half-shaded block. The four curves white on black. If you have any questions to ask apply & G.J. Burch, Esq Librarian Institute Civil Engineers. Do not begin till estimate is accepted. 10 March 1891